Each bulb is assembled from a small part into a complete lamp through many steps, including pad printing and mounting the lamp head, inserting, dipping, assembly, testing, packaging, etc.
The circuit board is the core of the light, the circuit board is good or bad directly affects the life of the light
Check whether the circuit board is qualified or not
Assemble the circuit board and bulb into a complete lamp
Testing light bulbs and eliminating failing products